Prevent admins from leaving a group
I was a group admin and unfortunately I successfully kicked myself out of the group and as I was the only admin the group was left alone.
The site admin manually corrected this afterwards, but IMHO this should not happen in the first place. Leaving a group as an admin is too easy: You only have to click "leave" in the classic view and everything has failed.
So please ether disallow admins to leave a group or show a big scary warning before doing so. At least an admin should not be able to leave a group if he/she is the only one.